Just fixes compiler warnings in gcc 4.8 and clang 3.4.

dlib/test/matrix3.cpp

@@ -634,7 +634,6 @@ namespace
             - runs tests on the matrix stuff compliance with the specs
     !*/
     {        
-        typedef memory_manager_stateless<char>::kernel_2_2a MM;
         print_spinner();
 
 

dlib/test/matrix4.cpp

@@ -32,7 +32,6 @@ namespace
             - runs tests on the matrix stuff compliance with the specs
     !*/
     {        
-        typedef memory_manager_stateless<char>::kernel_2_2a MM;
         print_spinner();
 
         {

dlib/test/opt_qp_solver.cpp

@@ -387,7 +387,6 @@ namespace
             print_spinner();
 
             ++thetime;
-            typedef matrix<double,0,1> sample_type;
             //dlog << LINFO << "time seed: " << thetime;
             //rnd.set_seed(cast_to_string(thetime));
 

dlib/test/pipe.cpp

@@ -65,7 +65,7 @@ namespace
                 int last = -1;
                 for (unsigned long i = 0; i < proc1_count; ++i)
                 {
-                    int cur;
+                    int cur=0;
                     DLIB_TEST(p.dequeue(cur) == true);
                     DLIB_TEST(last + 1 == cur);
                     last = cur;

dlib/test/scan_image.cpp

@@ -456,8 +456,6 @@ namespace
         typename image_type1::type thresh
         )
     {
-        typedef typename image_type1::type pixel_type;
-
         const rectangle area = get_rect(img);
         for (long r = 0; r < img.nr(); ++r)
         {